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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c3089fcc68bc70ffb2098a0a3e5b51f7d3a8b4442238b620a059eea56a3209' 
  AND token = 'GG7/qiUNrDl3dCNbLVSbzqDUqH/Jk92aG3NE+8wnaq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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