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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0080fed895438eb6a974f9fad21715ff4b101e6a168bb4c04f4020d2fbc7b8f7' 
  AND token = '7JyV/AholH83NJdtzb8omgEEWyDnssJqBHDPDIlnLGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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