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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c56dcce728813053529f32e37e691a4c2196240180b965aabdc1907109715f6d' 
  AND token = '5L9Q3Mn6p+GT4+2E3f+6DtLfsFSLVuQiJNkm5BVHe9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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