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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e13c4c77c5a30351b6705e6e06604f4050751fb94d33be172ac7f3dc9e95a59' 
  AND token = 'rccXeWbzrrG6vY/Ya1Z32kbd5GGbLunTnlVj12SOoeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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