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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14b9925842dca8de13c8b65081bb09e18af33c8a8895a14095e0f7241a1eedc' 
  AND token = '/NDf/Sk8xHX44ZK4EQfxjF0fvijEsAKfG5M2zbbpnUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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