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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0973b26da01b7b16597c31d3321214250ecd39a387955d16eff09f7728e82af1' 
  AND token = 'aBGMRVqX8Mjq5rMmf2ykyMDFulvcP0uPcs3o4Sfqqr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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