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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '495ce4bfe668698e70258303ef9bb234dbded167400332b8d82d051b34fc30eb' 
  AND token = 'Qnp+fqlLo8J5dI6AIAq2HCrRM/JVpVH/h5YpatFTkNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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