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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e47b10c4db616a2637c622bbc0cbb50ada361e7199309f7223be20449457ded' 
  AND token = 'b5gxO0uAEb0Fwrx4JiymL0b38QN3aIws33+9JOu7lrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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