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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05212766b1d332912930c3a772a1c4af6e0f70ff3ea2890301ed76701988df16' 
  AND token = 'gExmBacSu92F7eQLyMiwFgyklPEL9egAnN4Xecs1fVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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