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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdfb11bc93a17e187812bf7667e82b96fb942946ab26529f086068a097337df' 
  AND token = '+09KEz2zVmjb6DbYW9Dwmuzrmo8MUzPY2LGvlVUrlSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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