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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b174d8d5d68343304de8fd2d171f4b925f2738c97dc6148913badb031c661c5' 
  AND token = 'p0uUmpmQ7f+KENXg0M3IZwXIKbDOJvyhX3OefZT8DWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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