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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94758a584029afac995e0f9b1a308bb9973fe81878623272bc17e93fedc13557' 
  AND token = 'sKrRtMBVAXOBLxr6lVmgYFLTr2FDWeRECG/rPu1lzdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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