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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7ef8a4b4c937be37d1095846396c31094b895940391b9cd7526d2858e5cc66' 
  AND token = 'sV2CbnToF8aPVfjfZBbjFAdMj+6w2MViCF+Z6i+FzMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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