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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7190c1a0bdff1afd5abade1b06346e2f84b26ef1e84a67d569f583b4732c3e3a' 
  AND token = '1V0HskndymL5NEsj/GP+B+u3f1Z+RXbH+0qfv3fEJmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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