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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20885525796ac32f7bdfd1bf1df3d4973ac85ce0b2b402ef9f18ac6b81e14ca' 
  AND token = '0dmqyuAC8rR1vtX+Fjlv6KLuyGd3kAow87Ldoe6p4ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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