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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb0b3e094b0a98faa78d48250cb227df170a38156dc722b85f6266a5f0a2424' 
  AND token = '9BHDizpkdh6yeXI2L4sRJAAt48meuMor6r1NqeVSOmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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