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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d6b1388d23fca73ab297d48c4fbc2baf9f5430fb37e2a5f0b5f00ff54fc5c1' 
  AND token = 'Q4CdQudfpViAcqSoLc5Cg07UtZVj8I9nfopsiwkq2/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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