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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c773667149f3f0aa2c16bf3a27128d3369274a37d655ed013884cd9c12cf35d' 
  AND token = '0tRJeI1VXGm7WHkt/fvGREU0gHT/hnRc6unCEsiXSC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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