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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b544a38c3ddbf91c0228da0f54875e6852ead2fb76018f9122e9430c3627147' 
  AND token = 'THVcvnAGNopohVtN1Et/MaaHSQRWk0xOVTBPw40XrT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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