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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a0cd7801f66e87f224bdde90affa12f3a0f2cfce1a27a2dc4772255b23356c' 
  AND token = 'vWFSGk2XntcYujLy3rlKEMVfFEjzxLDKQCibzpkktuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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