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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83d4356b72722e7dfc4250a430e924ba58b311c62e13e7ec2aa7877a6683b3e' 
  AND token = 'PdpeluS3bU8cYBEsLULT6JWxgEYwh54J07ldfpqW6Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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