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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d1161542717dd0ca91b397c7b490394eba77eae65f9d10e7a1aa7357162f8b6' 
  AND token = 'Is+4P1ga2jyVC4QVHBdB5DP4gGLzO6RNpuWrVi0wY/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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