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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf584e383895b489edb8a61deee5e512f77815dc9ca957a0b0b99e2553e0b40' 
  AND token = 'dfX21tg87uc0+o/uzim5jnn3013WTpbfgsRJtyyB9es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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