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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f02438ade5e91474d101c09af795d1de6d3e830874c9b3ef8c285afb92ac5a' 
  AND token = '/3HNbmd2EmywRAI61EK71+V0SzeqNRmdlJQ8SndS5Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}