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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4bec0b82257cadf2da8fb1c6e099c9aebbdaed76f12c6b04fcd71230b84b1f2' 
  AND token = 'sF1m6fsdnwlkS7LO//SEP+kybfBha6511KldqUie0E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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