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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eac2a9bdc5e6987f11635eb4d3bd3a28c5857b0b2bdb12ea61a6d5d3137fd59' 
  AND token = 'ohhE3bx7OQzkzsr/NCqImqynv5wZl+Ozme9SJ09Zc2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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