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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58905daa6a982675d26fcfe4cb62a6259658d3507ff17eccf666d6690038572' 
  AND token = '7GBa2rrySpJd3W/yuuY2BpO48QcAbJgBJtZp0ixL8i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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