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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe880a8a62cc4d8937d6a1d4d9ade70d919c23097b9d71a2a62df7f9be81a00' 
  AND token = 'PF4z2lFDHEnf+WYEbdEVxz0DBQIBFpOrJikur9Bznf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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